package com.sky.aspact;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspact {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Throwable {
        log.info("开始进行公共字段填充");

        //获取当前被拦截的方法上的数据库操作类型(insert update等)
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获得操作类型

        //获取当前被拦截方法的参数(比如这里的实体对象)
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }

        Object entity =  args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT) {
            Method setCreateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
            Method setCreateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

            //通过反射来为对象赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        } else if (operationType == OperationType.UPDATE) {
            Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }

    }
}
